Relationship between direct and maternal genetic effects on weaning weight of Limousin and crossbred beef calves

Population genetic parameters, direct and maternal breeding value, the trend in weaning weight of Limousin beef cattle calves were estimated period 1992-2019. Data 19 764 (15 437 purebred 4 327 crossbred) computed. Crossbred sired by bulls from Simmental dams. Calves question came 37 herds 240 sires Hungary. DFREML MTDFREML software was used for estimation population BLUP animal model value estimation. Weighted linear regression describing trends. The heritability (h2m ± SE = 0.29 0.03; 0.32 0.10) approximately half (h2d 0.63 0.05; 0.68 0.12). covariance is negative, correlation coefficients (rdm -0.80 0.03 -0.96 0.07) are strong negative. Spearman rank between moderate negative (rrank -0.33; P < 0.01), crossbred it -0.99; 0.01). According to values sires, appeared stagnant during examined (b +0.01 kg/year +0.19 kg/year).